Electromagnetic vibratory device and method of making same



July 9, 1935. J, BERTSCH] 2,007,703

ELECTROMAGNETIC VEBRATORY DEVICE AND METHOD OF MAKING SAME Filed May 1'7, 1935 '15 points on saidelement.

ELECTROMAGNETIC VIBRATORY DEVICE AND METHOD OF MAKING SAME Jacob Bertschi, Chicago, 111., assignor to Utah Radio Products Company, Chicago, 111., a corporation of Illinois I Application May 17, 1933, Serial No. 671,455

Claims. (01. 200-166) The invention relates generally to electromag- Fig. 2 is a view showing the several parts of netic vibratory devices and in particular to the the reed assembly in perspective. vibrating or oscillating element of said devices Figs. 3, 4' and 5 are sections through the reed, and to the method of making such elements. on an enlarged sca e Show Successive t p 5 Devices of this character commonly include in the method of assembling the contact points 5 amovable element or reed which is usually on the reed. fashioned of spring steel or like material and is While the invention is susceptible of Various caused to oscillate or vibrate by the force of an modifications and alternative u ns, I intermittently energized electromagnet. Frehave Shown in e drawing andwill herein quently said element carries one or more contact scribe in detail the Preferred embodiment. but 10 points for making and breaking a .like number it is to be understood that I do not thereby inf circuits movement f the element tend to limit the invention to thespecific form Heretofore serious dim ult has been encoundisclosed, but intend to cover all modifications tel-ed in ti f t il mounting these bout-act and alternative constructions falling within the spirit and scope of the invention as expressed in 16 For example, if the element becomes permathevappfandedPlalms; nently distorted in the assembly of said points The {nventlon W111 be described, merely for thereon as may'occur in an upsetting or riveting lnustmtwe Purposes as being embOdied in one Operation, the normal operating action thereof form of an electromagnetic vibratory device. It 20 will be changed and it becomes impossible conunderstood noweveri that Present sistently to produce in quantity assemblies which mventmn may be used m connection wlth m are uniform in all respects. Hence each device types of devicis other than that Shownwith may require considerable adjustmentv after asto designates casing sembly particularly where the device is to be pnsmg base and cover element adapt UNITED STATES PATENT. OFFICE,

employed in connection with such electrical ed normally to be Secured together in any suit equipment as radio B battery eliminators or :2 E g 5 2 the casing current rectifiers. Likewise, if the points are as- 3 an e ectmmagnet sembled by any of the methods involving heat. g gfii 5 facmgmward the 22 :223 g g fi iizg g 5 fif g g gggffi In the present embodiment, the vibratory strucf cture is im ossible y ture by which the circuits to be controlled are general a j the invention is p made and broken, includes what may be termed a double contact point arranged to cooperate with duce an pro device of this character by and move between two fixed contact points. The

a novel and Si ple method whereby Such two fixed contact points are designated l5 and 35 vices may be produced in quantity and uniformity re supported in opposed, inwardly facing relaof operation in all devices so produced consistentm by stifl spring fingers l6. Spacingmeans l1 lyobtained. adjustably determines the proper distance be- Another object is to prod a improved tween the two fixed contact points. The vibravice embodying a movable resilient element havtory structure comprises a reed l8, which is sup- 40 c co tact po s mounted thereon by means of ported intermediate the two fixed contact points an interposed member which may be distorted 15, a double contact point i9, interposed bereadily to unite the parts. tween the two fixed contact points for coopera- A further object is to provide a novel method tion therewith, and an armature 20.

of assembling a contact point on a resilient reed The reed I8 is preferably of some resilient cur- 5 which includes the step of distorting 9. connectrent conducting material, ,such as spring steel, ing member so that parts of said member. are and in this instance is in the form of an elonforced into rigid engagement with thepartsto gated plate (see Fig. 2-). Y be connected. Suitable supporting means, indicated at 2|, in-

Other objects and advantages will become apcluding the usual strips of insulation for elec- 5' parent in the iollowingdescription and from trically isolating the several parts, secures the the accompanying drawing, in which: finger I6, spacer l1 and reed I 8 through corre- Figure 1 is a longitudinal vertical section spending ends thereof to the end of the base op-- through the casing of a device embodying the posite the electromagnet. When the parts are 5 features of the invention. so supported, the armature 20 is located within A description of the mounting of the double contact point I! on the reed lt will be given as,

an example of one form of the invention. Referring to Fig. 2, 22 designates an aperture formed in the reed it at a point which will be alined with the fixed contact points I5 when the parts are assembled, which aperture is somewhat larger than the doubl contact point I! (as may be seen in Fig. 3). Intermediate its ends, the contact point I! has a depression formed therein which, in this instance, is in the form .of an annular peripheral groove 23. When the contact point is positioned in proper relation to the reed i8 in the assembly of the parts, the groove 23 is opposed to the margin of the aperture 22.

Interposed between the contact point and the margin of the aperture is a sleeve-like connecter 24 (see Fig. 4) which fits snugly about the contact point and within the margin of the aperture. The connecter 24 is preferably formed of 8. ourrent-conducting material which may be readily deformed or distorted under normal shop temperatures. Silver has been found to be a suitable material. If desired, an'internal edge at one end of the connecter may be beveled, as at 25, to facilitate insertion of the contact point. After the parts have been assembled as shown in Fig. 4, the outer edges of the connecter 24 are struck inwardly at an angle to the plane of the reed and to the axis of the contact point by means of'a suitable tool. By this operation the connecter is deformed so that a portion 28 thereof enters and fills the depression or groove 23 while other portions 21 are forced into a firm gripping engagement with the reed about the margin of the aperture 22. This relationship of parts -is shown in Fig.5.- a

It will be evident that a novel method of attaching contact points to resilient reeds has been produced whereby the parts are rigidly secured together withoutthe use of a heat treatment and without distortion ormachining of the contact points. Consequently, there is no distortion of the flexible reed which would produce a variation in the movements thereof, and the reed assemblies may be manufactured in quantity and with sub- ;stantial uniformity. Moreover, an excellent electrical connection between the sembLv is attained.

I claim as my invention:

1. 'The method of securing a contact point to a thin spring tempered vibratory member while maintaining substantially the original flexibility and resiliency of said member which consists in forming an aperture in the thin member without distortion thereof, locating a contact point of substantially less diameter than said aperture and having an annular groove therein within said aperture with said groove opposing the margin of parts of the assaid aperture, interposing a bushing of an easily distortable soft and current conducting material between said margin and said contact point, and distorting said bushing to turn the ends thereof over said margin and to force an intermediate part of the bushing into said groove to secure the parts firmly together, the bushing distorting force being so applied that no distortion ofthe vibratory member occurs. 7

h 2. A vibratory reed for a device of the character described which is adapted to vibrate accurately due to the absence of reed distortion and comprises the combination of a thin fiat member formed of a spring tension material of determined vibration frequency and having an aperture therein defined by a substantially undistorted margin of the member, a contact point of substantially less diameter than said aperture and extending therethrough, and a bushing in said aperture and about said point formed of a soft material which is a good electrical conductor and is capable of being easily deformed into g ipping engagement with said point and margin by the application of a force which will not distort said member so as to preserve said vibration frequency.

3. In a vibratory device, a thin, fiat reed mem ber having an aperture therein defined by a substantially undistorted margin of the member, a cylindrical contact point extending through said aperture and being of a diameter substantially less than said aperture, and a deformable connecter fashioned as a cylindrical bushing fitting snugly about said point andsubstantially occupying the space between said point and said margin, said connecter having an internal surface beveled toward one edge to facilitate reception of said point in assembling the device.

4. A vibratory reed for a device of the character described which is adapted to vibrate accurately due to the absence of substantial reed distortion comprising, in combination, a thin fiat resilient member having a determined vibration frequency, said member having an aperture therein defined by a substantially undistorted margin margin of said member defining said aperture,

and a bushing in said aperture and about said point formed of a soft material which is a good electrical conductor and is capable of being easily deformed into gripping engagement with'the side faces of said member about said margin and into the groove in said point by the application of a force which will not distort said member.

5. The method of securing a contact point to athin vibratory member. of spring tempered material while maintaining substantially the original flexibility and resiliency of said member which comprises the steps of forming an aperture in said member without distortion thereof, locating a contact pointof substantially less diameter than said aperture within said aperture and extending therethrough, intcrposing a bushing of an easily distortable .soft'and current conducting material in said apertm'e and about said point and deforming said bushing into gripping engagement with said point and margin by the application of a force which will not distort said member whereby to preserve .said vibration frequency.

a JACOB naa'rscnr. 

